Exercise 14: External Variables and Scope ("external_variables") ("Chapter 1.10")

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Looking for help creating exercise:
Topic: External Variables and Scope
Exercise Directory Name: external_variables

Note: For Directory Name, refer to the exercises directory to find the correct number to use. It should be close to the number in the issue title but may be slightly off.

Refer to "The C Programming Language" book, Chapter 1.10 for more information.

Contribution instructions: https://github.com/danwritecode/clings?tab=readme-ov-file#contributions